JPS596785B2 - Construction method of tire bead protection member - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of constructing a protective member made of a high-hardness rubber-like material to prevent damage to the bead portion of large pneumatic tires, such as tires for construction vehicles, during transportation and other handling processes. Specifically, it consists of a linear molded body with an L-shaped cross section, which has a structure that contributes to protecting and fixing the bead part and greatly contributes to curvature, and is sized to accommodate various sizes according to requests. A bead for a construction vehicle tire that can be produced at a very simple manufacturing process and at a low cost, which can be adapted to various tire sizes from the same molded product and easily adaptable to the shape of the bead part by the method of connecting to the The aim is to construct a tire bead protection member that protects the tire bead.

Conventionally, commonly used tires for construction vehicles are:
It is designed to be applied to a variety of applications, including tires for vehicles transporting earth, sand, ore, wood, etc., and tires for machinery for excavating, excavating, shoveling, leveling, loading, etc., and its size is 90.
0-20~4000-57, 15.5-25~37.5
-39 etc., and the weight ranges from several hundred kg to 3500 kg.
It reaches more than g.

Therefore, as a bead protection member for a tire, there are various sizes of the inner diameter of the bead portion, that is, the rim diameter, and it is necessary to construct various types of circular endless type members that fit the respective tire bead portions.

If these various circular shapes were to be molded, a huge amount of molding costs would be required, and the mold would also be considerably heavy, making it difficult to handle and increasing labor costs.
If it is used as a mere protective material until it is used, it will result in a large sacrifice in terms of cost.

Therefore, the inventor used a high-hardness rubber-like substance such as high-hardness rubber or elastic plastic, and heat-molded the mold using a simple straight-line shape and short-length partial mold that could be obtained at low cost. The L-shaped molded body is then cured and molded into an L-shape of a required length by sequential feed molding, and this linear molded body is curved and connected in an endless state for use.

The above-mentioned high hardness refers to a hardness of about 85 to 950 as measured by a JIS hardness meter for spring type rubber. However, it is impossible to manually bend a long L-shaped linear molded body with a flange into an endless annular body, and it is impossible to bend it by hand. A structure is needed to do so.

However, since this protective member comes into contact with the bead of the tire and is fixed by tightening with a fixing band, even if there is some distortion, it can be corrected by fitting it into the tire bead and tightening it. Any material may be used as long as it can provide a protective function. That is, it is necessary to have a configuration in which the rubber-like material can easily curve while maintaining practical rigidity and exhibit followability during bending and tightening. The above-mentioned structure for protecting and fixing the bead part and contributing to curving is such that the linear molded body is curved on the inside of the L-shaped flange part, that is, on the side that contacts the outside of the bead part of the tire, to facilitate endless annular deformation. A large number of adjustment grooves are set perpendicularly to the outer edge of the flange, and the groove width gradually increases in the direction of the outer edge. Concave portions for curve adjustment are arranged in an even distribution over the entire surface.

The recesses have various shapes such as round holes, elongated holes, and oval holes, and are arranged in various shapes at equal intervals. The bottom of the adjustment groove should have a sufficiently large R (fillet) to prevent cracks.

In addition, it is preferable that the intersections of the respective surfaces of the recessed portions and the like be rounded. As mentioned above, it is extremely difficult to endlessly curve a linear molded body with an L-shaped cross section.
On the side that contacts the outside of the bead of the tire, that is, on the inside of the L-shaped flange, a large number of adjustment grooves whose width gradually increases in the direction of the outer edge are arranged, so when the tire is endless, an annular body with an L-shaped cross section is formed. be done.

Although some distortion occurs when it is bent, this is corrected when it is fitted into the bead portion, and it is tightened tightly.
In addition, by arranging anti-slip and curve adjustment recesses on the entire inner surface of the bead base abutting part in an evenly distributed manner, it helps the curvature of the relevant abutting part and also helps the bead base during contact. It acts as an anti-slip agent and exhibits a good protective function.

Note that the means for connecting the molded long linear molded body to the endless fitting circumference of the bead base of each tire is bonded or joined by various types of joints. Next, a method of constructing a tire bead protection member of the present invention and a method of fixing it to a tire will be described based on illustrative drawings.

FIG. 1-a is an enlarged partial perspective view of a long linear molded body of a tire bead protection member before endless processing,
This figure shows a linear molded body with an L-shaped cross section made of a high-hardness rubber-like substance.

In the figure, 1 is a linear molded body with an L-shaped cross section, 2 is a flange part, 3 is a bead base contact part, 4 is an outer edge of the flange, 5 is an adjustment groove, 6 is a recessed part, and the illustration shows a round hole. This is an example of arranging them in a staggered manner.

The adjustment grooves 5 are provided on the inside of the flange at equal intervals over the entire length in a direction perpendicular to the outer edge of the flange, and the groove width is formed to gradually increase in width toward the outer edge. Note that the outer corner C of the L-shaped cross section does not have to be arc-shaped and may be connected by a plurality of chords, as shown in the enlarged view of FIG. 1-b.
As described above, the recesses formed in the bead base abutting part are of various shapes arranged in an even distribution over the entire surface, and serve to prevent slippage and adjust the curvature. A linear molded body with an L-shaped cross section provided with adjustment grooves and recesses is used as a bead base B for construction vehicle tires.
The tire bead protection member P, which is an annular body having an L-shaped cross section, is connected to an endless ring having a length corresponding to the fitting circumference of the inner diameter of B.

As shown in FIG. 2, this protective member P is attached to a tire to protect the tire bead. Figure 2 shows
1 is a perspective view showing a tire bead protection member P fixed to a bead base of a construction vehicle tire. In the figure,
0RT is a tire for a construction vehicle, B is a bead portion, BB is a bead base, and P is a tire bead protection member obtained by endlessly processing a linear molded body 1 having an L-shaped cross section.

As shown in the figure, the bead base contact portion 3 of the protection member P is placed in contact with the bead base BB of the construction vehicle tire 0RT, the flange portion 2 is placed in contact with the outside of the bead portion B, and a rope or steel band is placed in contact with the bead base BB of the construction vehicle tire 0RT. It is protected by fixing it in several places with bondage belts 7 such as.

As explained above, the method for constructing the tire bead protection member of the present invention is to construct the tire bead protection member endlessly from a linear molded body having an L-shaped cross section having a structure that protects and fixes the bead part and contributes to curvature, so that the tire bead protection member is cut to a required length. By simply doing this, tire bead protection members of various sizes can be easily manufactured, and the manufacturing process is extremely simplified and can be obtained at low cost. Because it is deformed, when it is fixed to a tire, a large contact stress acts on it, and it also has the feature of exhibiting good fixing properties.

In addition, since a concave portion is formed in the bead base abutting portion, it is not only easy to bend the bead base into an annular shape in the construction method, but also provides good fixation between the protective member and the tire bead base, eliminating the risk of loose movement. do not have.

By providing the concave portion, the weight can be reduced while maintaining practical rigidity, and in the case of a protective member fixed to a tire with a large rim diameter, the weight is reduced and the work becomes easier.

In addition, since the adjustment groove is formed in the flange, the width of the groove can be easily changed, so the circumferential length can be adjusted, and the work of bending into an annular body is facilitated, which facilitates the construction of the protective member, as described above. . Furthermore, the angle between the tire bead base and the outer surface of the bead and the shape of the outer surface of the bead vary depending on the type of tire, even if the tires have the same rim diameter. Since the adjustment groove is formed in the flange part, it can easily follow the shape of the outer surface of the bead part by changing the groove width, and also has the property of exhibiting good fixing properties.

[Brief explanation of drawings]

FIG. 1-a is an enlarged partial perspective view of a long linear molded body having an L-shaped cross section for configuring a tire bead protection member;
Fig. 1-b is a cross-sectional view showing an example of another shape of the outer corner of Fig. 1-a, and Fig. 2 is a partial cross-sectional view of a construction vehicle tire to which a tire bead protection member is fixed. 1 is a perspective view of a linear molded body with an L-shaped cross section, 2...
... Flange part, 3 ... Bead base contact part, 4 ... Outer edge of flange, 5 ... Adjustment groove, 6 ... Concave part , P...Tire bead protection member, 0RT...Tire for construction vehicles,
B...Bead part, BB...Bead base.

Claims (1)

[Claims] 1 Inside the linear flange part of a long piece with an L-shaped cross section, which has a flange part made of a high-hardness rubber-like material and a bead base contact part, the flange part is adjusted at equal intervals over the entire length in a direction perpendicular to the outer edge of the flange. The width of the groove is gradually increased in the direction of the outer edge, and the recesses for anti-slip and curve adjustment are equally distributed on the entire surface of the inner part of the bead base contact part. A molded long piece of L-shaped linear molded body with an L-shaped cross-section is cut into a predetermined length and connected endlessly to protect the bead part of a construction vehicle tire. A method of constructing a tire bead protection member, the method comprising forming a tire bead protection member into an annular body.